Prestressed cable anchorage system

Abstract

A prestressed cable anchorage block having at least one orifice bore extending from an anchorage point of the cable to the outlet of the block. The at least one orifice bore has a longitudinally increasing cross section beginning at the point of anchorage until the outlet of the block.

What is claimed is: 
     
       1. An anchorage block and a prestressed cable, said block comprising at least one orifice bore extending from an anchoring point at which said cable is anchored to said block to an outlet of the block through which said cable extends when it is attached to said block, said orifice bore having a generally increasing cross section beginning at said point and extending to the outlet of the block for supporting the prestressed cable, said orifice bore being curved and having a generatrix in the form of the arc of a circle. 
     
     
       2. The anchorage block as defined according to claim 1 wherein said orifice bore is curved in the direction of the longitudinal axis of the bore. 
     
     
       3. The anchorage block as defined according to claim 1 wherein the generatrix of said at least one orifice bore is a regular curve. 
     
     
       4. The anchorage block according to claim 1 wherein the horizontal cross section of said at least one orifice bore is in the form of a polygon. 
     
     
       5. The anchorage block as defined by claim 4 wherein said polygon has rounded corners. 
     
     
       6. The anchorage block as defined by claim 1 wherein the horizontal cross section of said at least one orifice bore is in the form of a circle. 
     
     
       7. The anchorage block as defined by claim 1 wherein said at least one orifice bore is frustoconical and is formed by a curved line generatrix. 
     
     
       8. An anchorage block and a prestressed cable, said block comprising at least one orifice bore extending from an anchoring point at which said cable is anchored to said block to an outlet of the block through which said cable extends when it is attached to said block, said point comprising means for limiting movement of said cable, both in a substantially horizontal direction and in a substantially vertical direction, said orifice bore having a generally increasing cross-section beginning at said point and extending to the outlet of the block for supporting the prestressed cable, said orifice bore being curved and having a generatrix in the form of an arc of a circle.